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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 353 (Hybrid/EV Energy Storage System) >> Diagnostic Information and Procedures >> DTC P1A0C or P1A0D >> Circuit/System Testing

Circuit/System Testing

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    WARNING:

    Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

    The High Voltage Disabling procedure includes the following steps:

    • Identify how to disable high voltage.
    • Identify how to test for the presence of high voltage.
    • Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

    Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:

    • Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.
    • Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.
      • Visually and functionally inspect the gloves before use.
      • Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.

    Failure to follow the procedures may result in serious injury or death.

  1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling .
  2. Ignition OFF, disconnect the X1 harness connectors at the drive motor generator battery control module.
  3. Ignition OFF, scan tool disconnected, open and close the driver door and wait 1 minute. Test for less than 5 Ω between the ground circuit terminal 11 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  5. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 12 and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the serial data gateway module.
  6. If all circuits test normal, replace the drive motor generator battery control module.
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